Probably, although it is a little unclear when you stated that the repurchased shares were the "unvested portion" of the RSA granted to you. However, given that you included the fair market value of the grant in your compensation, then using the fair market value as your basis seems reasonable. When you say that you paid "$0 out of pocket," it does appear that the grant was not really cost-free to you because the amount was included in your compensation and thus was subject to tax, and in regard to the tax issue, you appear to have timely made an 83(b) election. Thus, given that the FMV of the stock was included in your compensation at the time the grant was given to you, it appears reasonable to use the FMV when determining the extent of your capital loss.
It is recommended that you keep every record/document that supports your calculations. For example, keep a record of your paystubs, and other compensation records, for the period when the grant was included in your compensation, and further keep whatever records you have regarding your 83(b) election. You might also want to maintain whatever documents you can find from the company that describe their forms of compensation especially with regard to stock grants of the type you received.
@dave4447
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