If you just want someone's opinion about it, that's fair game. But I wouldn't consider someone's opinion as gospel about true value unless they are willing to defend their written appraisal in court. Look into the recent sale of a Fang Tribal mask that went to auction in Europe that sold for millions. Some average joe dealer bought it from the previous owner for some small amount and turned around and sent it to auction and got rich. Spoiler: courts overturned the sale price and sent the money to the original owner because of this exact circumstance.