A Leprechaun got Tucker's gold and triggered the trap, but escaped.
Carson had two traps, one with fools gold and one with real gold, but his sign said there was lots of gold in the trap with the fools gold. It looks like the Leprechaun was mad about the fools gold, so he knocked down the trap and didn't touch the trap with the real gold.
Tuckers Trap (above)
Carson's Traps (above)