I just found one today when I went out hunting for meteors. It was 2 tiles away from where I had probably walked 20+ times over the past 9 weeks (right between my deed and my neighbor's)! The contents even had a bit of damage from sitting there all this time. Found it 1 minute into my 6 hour journey looking for meteors (which I didn't find!) but at least it got me outside. SO... they are definitely still out there waiting to be found!