I am not sure if this is directly connected with case of OP finding paper wallet or if this was posted before, but there is very similar situation happening in Melbourne, Australia.
This appears to be scam attempt with QR code with a key to access the account with alleged 0.62 BTC which can be withdrawn.
Printed address starting with 1LMy3... has total deposits of only 0.15 BTC if you look in blockchain explorer, and coins are flagged as fraudulent or scams.
This was posted on Bitcoin reddit channel, it's called “Printkey Wallet” and this is how it looks like:


https://www.reddit.com/r/Bitcoin/comments/wuf2ke/scam_found_these_littered_around_my_suburb_in/