I think, just do not Grabar, he never worth much.
In general, many boards (lawyers, banks) are far from the real work in our market - no serious end buyer (especially on such amounts) will not go to the bank, a lawyer and so on, at best, come to the gallery to a trusted dealer , if not out of the office will not work!
According to this, basically everything is based on trust, appear only receipts and contract committee (the case of a gallery or antique). In your case it is better to write a master that you take the thing for sale or commission, and to search for a gallery will sell it to you. To rent the gallery thing on the contract-Commissions in your name and then you will avoid problems with the commission.
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