Franky you are forgetting about something. Let's put the terminology aside or if you want, let's call it a bitnote. So OP found a bitnote. Maybe person A created said bitnote and gave it to person B, and person B is the one that lost it or had it stolen. You could be right that whoever created the bitnote didn't want to keep it for themselves. But that doesn't mean the physical item wasn't given to the other recipient who now no longer has access to it.

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easternklaas hasn't written anything for a few days, but I am sure he/she is still checking this thread. @easternklaas can you tell us what is written on it besides the keys? You mentioned a logo and a website. Share some more info about it.