They are every bit as liquid, if not more so!
Nah, they’re definitely more liquid when they’re melted.
I doubt this is true for recently produced gold coins (Maple Leafs, Krugerrands, Pandas, etc) which are probably the majority of the gold coins in existence. Very few gold coins are old and rare enough to be valuable as collectors.
IMHO, IF the pawn shop melted the coins, they got less for them they could have by reselling them in their unmelted form. IMHO, they didn’t melt them, they only said they did to avoid losing their money spent/profit.
There are hundreds of thousands of U.S. gold coins minted before 1933 which still exist and are worth more than their melt value.