According to Oregon law, they cannot delay delivery of the firearm more than three business days. Maybe if you print that out and take it to the shop they will release your firearm per Oregon law.
Here is the ORS relevant to your situation: ORS 166.412 - Definitions - 2011 Oregon Revised Statutes
Note section 3, part C:
Here is the ORS relevant to your situation: ORS 166.412 - Definitions - 2011 Oregon Revised Statutes
Note section 3, part C:
If the department fails to provide a unique approval number to a gun dealer or to notify the gun dealer that the purchaser is disqualified under paragraph (a) of this subsection before the close of the gun dealers next business day following the request by the dealer for a criminal history record check, the dealer may deliver the handgun to the purchaser.