Step one- Post an image of it and see if anyone recognizes it.
Step two- Until you know who created it, when using it in your work, place the credit as "Such and such mesh by UNKNOWN"
This way, people know you aren't trying to take credit for work not your own

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"Don't worry, miss. I've got you." "You got me? Who's got you???" - from Superman- The Movie
"Some of you may die, but that is a sacrifice I am willing to make." - from Shrek
" If not for TOS, then there would be no Trek movies, TNG, DS9, Voyager or 'Enterprise'. "
"Legends never die... They just get new Captains."
"The art of scape goating interests me." - Dauntless