It happened in the last 5 minutes.

Ok, I was hosting a skin comp like normal, someone came in. Another skin comp was going on so it was slow. She left to get something, later leaving the game!? This is the second time someone just left their grass with me, I feel like I'm a scammer when people leave their grass with me without a comp!

 

Either reserve their place for 5 minutes. Or if they for example get on the next day give them back their grass. It happens bud but its not a scam unless you decide to keep the grass for yourself

 

You should reserve their spot like Bert said. Also, message them to make sure if they're coming back, and if not, give them their grass back. And even if they don't get the grass back, you are still not a scammer because it was their decision to leave without a refund.

 

If they leave and don't come back before you have to go, it doesn't make you a scammer.

 

Consider it a donation. This happens all the time. I have done this to others before. It never hurt my feelings when they just kept my grass

 

Keep the grass until the next day. They know that you have it.