[US] Man came into my small medical practice and credit cards information? Stickers, tap to pay placards, snooped around

Hi, I run a small medical private practice and while my clinicians were in appointments, a stranger came into the office and left various stickers on my doors about credit cards (saying we took cards we don’t, a large AMEX sticker for another one) and a patient mentioned they saw him looking around in our staff areas. He left a ”tap to pay” placard in our staff kitchen on top of our nespresso machine and apparently asked where the front desk was, but we are a private small business and don’t have one.

Has anyone heard of something like this? We alerted the police and our landlord due to the fact that the population we treat is high risk for hate crimes and we are concerned it could be setup for a future crime. I am going by the office soon (I was out of the state) and will be looking more closely at the signage left in case it has RFID chips or other identifying information. No business card left, no one attempted to contact me as the owner, and no other businesses in the building are aware of something like this. Any ideas?