Earlier today someone asked on the #sqlhelp Twitter alias if there is a history of database snapshot creation anywhere, apart from scouring the error logs.
There isn’t, unfortunately, but you can dig around the transaction log of the master database to find some information.
When a database snapshot is created, a bunch of entries are made in the system tables in master and they are all logged, under a transaction named DBMgr::CreateSnapshotDatabase. So that’s where we can begin looking.
Click through for the script and some explanation around it.