I went to skate today and it was gonna rain so there weren't many people there. Just some girls rollerblading and these 2 guys chatting about to leave. I go skate, everyone else leaves, and then it starts to rain so I leave. As i got in my car i noticed one of the 2 guys' boards sitting in the grass by where he parked. He probably forgot to put it in his car after talking with his buddy. I took it home because if it just sat in the rain it would've been fucked, but now if I don't get it back to him I'm a shithead thief. What do I do? I don't even go to that park often so it's not like I'll be back tomorrow and I'll just leave it at the same spot.