The smugglers got caught in Lvov, Ukraine when they tried to transport gold bars hidden in the can of paint. This is how they got caught:
They really forgot that custom services have the metal detector scanners that show metal objects even if they are hidden in the paint and not visible. When the customs workers so this image they of course wanted to open this bucket:
And this is what they found.
Different sized gold bars, 999 pure.
Now the gold is seized.