Answer:
Ummmm, I hope I did this correctly.
Step-by-step explanation:
Dear (name of person),
I had such a wonderful time visiting you this week. I hope I can visit you again soon! I left my (name of object) at your house I think. I think it was (location of object). If you find it, can you put it somewhere safe until the next time I visit you or can you mail it to me?
From, (your name)