A safe big enough to hold half of my collection was very expensive, we had an old small upright freezer that had a lock,only cost about 70 bucks, and I use that to store most of my coins. Just put about 10,000 wheats on the bottom and it is too heavy to carry out, easily anyway. Plugged in, but not turned on, no need to keep them frozen.
There was an older movie with gene hackman in it about two groups of people fighting over gold in a gold heist... The gold that Hackman's character had absconded away with was hidden, painted as pipe and also buffed as pipe on his sailboat...... watch the movie, get inspired