call the Henrico Finance real estate information "hotline". By touch tone you can get the most recent sale price by entering the street address. 804-755-7380. I'm surprised the real estate agents didn't tell you this.
Many times the sold information that appears in these websites is derived from the tax record which may not be updated for some time after the sales transaction is recorded. Was this property listed in MLS? If you provide the address of teh propery, I will look it up in the MLS archive as well as Henrico Co. tax records.