Digging, digging, digging...then you find something! Is it worth picking up? Yes, it all is, but some are worth more than others. Here are the prices (in toilet paper rolls) I was offered for each item. I don't think they are affected by the price bonuses from cell furniture/deco, but if they are then at least you can tell garbage from gold on a scale.

Soup 3 TP
Boot 3 TP
Soap 4 TP
Wrench 4 TP
Rubber Duck 4 TP
Canteen 5 TP
Lighter 5 TP
Padlock 6 TP
Old Coins 6 TP
Flashlight 7 TP
Watch 8 TP
Flare Gun 9 TP
Binoculars 10 TP
Candlestick 10 TP
Goblet 12 TP
Gold Plate 13 TP
Silver Ring 14 TP
Bronze Statue 15 TP
Gold Ring 16 TP
Silver Idol 16 TP
Silver Statue 18 TP
Skull Ring 18 TP
Gold Statue 20 TP
Gold Idol 23 TP
Gold Bar 30 TP