We dont have a garbage file like windows so you would need to post details about the post that was deleted. Best way to go about this is to send an email to the moderators of that forum. Any of us would be happy to tell you why your post was deleted.

If your post was in the for sale section and didnt have a FS/WTB title then it was deleted as soon as any of us saw it. Read the rules in that forum before you ssend an email, it may answer your questions.