It's happened so many times in both DotA and Dota2 . . .

When I used my Courier to trade my item , others people on my team use it after me to trade their Item, and sent my item back to Fountain.

Maybe something in Dota2 to inform like " Player01 is Using Courier to Trade/Back Home/Find SecretShop "

Would be nice, at least it can tell you who is using it after you.

Thank you