So i'm subscribed to /r/freebies anyway just because very rarely there's some good stuff in there but whatever. But I think it's worth heading over there and signing up for some realistic yet random stuff so if you're one of those people who doesn't get much mail, this might me a good way for to normalize things a bit and kind of blend things in.
Maybe this is the exact opposite you want to do and make it people think "why the fuck is this dude getting so much mail" but I'd rather them think that than wonder "why is this dude randomly sometimes getting stuff from overseas?" when I could have a steady stream of crap to blend it all together.
Worst case scenario you just get some extra shit you need to throw in the garbage, doesn't seem like that bad of a trade off.
In the last maybe 20 minutes I signed up for maybe 10-12 free samples for stuff, I'd say every couple of weeks or month i could do this and I'd be good. Ive done this before and sometimes you don't get stuff for like 6 months or sometimes even a year, so doing it every month or so could help fill out the gaps because you never know when that stuff will show up.
or you could like, use your po box for mail and get real mail sent there.