Dan just started doing the LXo3 clock upgrade lately, so any on used market are 99% probably w/out the clock (as is mine, without the clock, that is). Dan charges $350 or so for the clock upgrade alone. My Platinum (to die for) has about $2300 in it (also includes new opamps for mch), including cost of original player on ebay. NOTE: if he calls it Platinum it ipsofacto has Bybee ac and slipstreamers; that is part of what defines Platinum level). These levels are defined on Modwright.com
If his is a Silver and Dan added Revelation umbilical? (kind of a platinum without Bybees is all I can guess) I would guess he has a total of $2k or so in it; $1200-1500 would be a nice used number maybe? If it's "just" a signature truth mod, then lower the list by another $300 or so.
My $.02
Ted