The dealer said it was because their invoice for their UACC RD status was lost in the mail and they should be one again by 2008:
Having had our stock and credentials vetted by the UACC Review Committee we were UACC Registered Dealer Number 273. UACC Registered Dealers have to abide with a strict Code of Practice and undergo regular vetting of stock. We are long established businesses with faultless records. UACC Registered Dealers are without question market leaders, we are professionals who sell the best quality, authentic autographs available. Whilst our status has temporarily lapsed due to an issue with non-receipt of a renewal invoice from the UACC, we hope to be re-confirmed in the UACC Registered Dealer program within the first few months of 2008.
TPA services have decreased the significance of seller affiliations. Being a registered dealer or not does not reflect poorly on them. It still comes down to authenticity and customer service.