"When we arrived, Will the art curator told us our painting would likely sell for somewhere in the region of $3,000 to $5,000 [£2,374 to £3,957]," she explained.
She then decided to have it appraised by a group on Facebook, who told her the painting was not only real, but could be worth something.
Marissa urged fellow TikTok users to look for hidden gems in charity shops, because you never know what you might find.
She took to TikTok to show off the find, and explained how she verified her suspicions that the piece could be worth something, leaving users stunned.
"I have a painting with it's own documents sealed in the back, I don't know where to take it to have it sold legitimately," one said.
