Early fs2000?

So I beleive through research that the 1st run FS 2000's started with SN#5000? I have gun 57XX. It is new in box. Factory mag dated 06(bought new back then) that has been inserted a few times just for looks. Im thinking I want to sell it but am unsure of value. Is there even a market for these?(yes it has the early trigger pack)
I don't want to look like a dumb azz and ask to much but i do not want to give it away either. Any constructive thought would be appreciated. I looked on gunbroker($1850-$3100) I also have a Black SCAR 16s NIB same question. Im thinking $1800.oo on the 16S?

Thanks, DD