Found this intricately wrapped bundle deliberately tied high up in a tree. Any idea what it could be?

[u/miss_solrik]

EDIT: To clarify, I already opened it!
For a couple of weeks, I'd been noticing this strange object hanging from a tree in my apartment complex's gated courtyard. During our annual spring clean-up in mid-May, my neighbors and I got a ladder and brought it down.

It was an envelope inside a Ziploc bag, wrapped tightly in a LOT of string.
The paper was waterlogged and mostly disintegrated, but I could make out the year "2021" on what looked like an official letter or bill.

It hadn't just been tossed up there and gotten stuck. It was deliberately tied to a branch with a knot,
and was so high up that even a very tall person would have needed a proper ladder to put it there.

Has anyone come across anything like this before?
Is there some significance to wrapping and hanging something like this?
Am I missing a perfectly ordinary explanation?