More than once. Glasses ( just readers) a jacket no big deal and a pack of weed all rolled up. I told her to just spark them up and enjoy.

it is a tip

I always leave one of my socks behind as a tip!

To make matters worse, I couldn't remember what room she was in, so I called my phone from a pay phone in the lobby hoping that she would answer it, and she did.

Beyond that, I've left dozens of bottles of massage oil, but they were welcome to it.

 
I also left behind a piece of silver flatware, but I told her to keep it as a memento.

 
On the other hand, gals are always leaving behind their panties, I've noticed when I host them.   I've got quite the collection.

 
And even one pair of stripper shoes.   She didn't want them any more because I had inadvertently placed them on a table.  apparently, that is a big no-no.

I’ve never left anything behind but when I host there is always something that gets left behind purses, panties, stockings, socks, bras, shirts, sweaters, sunglasses and sexy toys.

I left behined one of my toys at outcall, not far from where I live and he never text or call me to pick it up  
Now what is he doing with it ..lol

I’ve left behind:  soap, shampoo, oil, hair brush. I just say keep if you want, otherwise please trash it.  

Sometimes, they keep the oil.