Good job. Some pointers/things I noticed:
*In the beginning the random shots of things, I think the angles look good, but it was kind of confusing in that I didn't know where I was or what I was really looking at (I'm guessing it's meant to be ambiguous at the beginning, but I think you've inadvertently broken the 180 rule by not establishing where you 'line' was in the first place.)
An example of a cut you did that looked good and didn't confuse me was when you go from the medium shot of you to the close up shot, that was perfect. Also, are you trying to show the passage of time like all those things are happening and she(you) is (are) waiting and waiting? If that's the case, one trick that might help would be to just do a quick fade to black and back in between each.
*The piece would seem a lot tighter if you made some of these shots shorter in length. There was a sequence of shots near the beginning that could have been half as long and conveyed as much information. Like I said before, if your trying to convey the passage of time, fade out/in is a subtle way to show the audience that, we are all trained to know that a fade means that unconsciously.
*Some music could go a long way. Not only would it set the mood, but it would help keep us interested during those longer shots.
*One thing I think would be cool, but this is just a style thing, not really a criticism of your short, is if when you need to show emotion (and your wearing a mask so that makes it hard) maybe instead of trying to mime out the emotions or reactions with your body, change masks to one with the proper emotion. You said you are a collector of masks so this probably is a possibility for you, no?
*If you want to fix the sound, that could be easy with this piece as it's silent. Two step (sort of) process: 1) Remove all audio tracks in your editing software. 2) Add in sound effects/art i.e.: get a file of a faucet dripping and line it up etc. This will actually fix any sound problems you've got, as you will have deleted all of the bad sound and replaced it only with clean sound. All that's needed it to make the levels of the individual sounds sound natural (not that that is necessarily easy).
*How did the package get there without a stamp or address on it? Was that on purpose?
*I think your angles are good, you are getting good camera movement in shots as well. (i'm jealous of your extra pair of hands)
*Your mixture of the POV shot and the shot from up on the balcony, maybe it was just because it went straight from one to the other that it stood out to me, but you seem to intermingle them a lot, and I'm not sure if that actually breaks rules, but I think you need to decide on your perspective. The POV makes us feel like we're walking in the characters shoes, it's a very personal intimate kind of thing, so we can see through their eyes. Your choice of using that for picking up the package works because it seems like that package was the only thing she could see, a tip for making it better might be to add a little vignetting on the POV shots, like she has tunnel vision only for the package.
Like I said, that was a good use, but then you switched to that shot from the balcony, like we are spying. That's a far cry from the intimate look we were just privy to. That shot was ok, but I think for this piece the intimate style would serve you better. Maybe instead of the balcony shot you could have the camera then be from the packages perspective looking back up at her?
*What happened with the other mask? Did she put it on? Which one was she holding and why did she leave?
I hope none of that came of mean because I certainly don't mean it that way. Can't wait to see the second draft