Question about Master Lock Safety safe

That depends on the price of the Bitcoins: If you have more market value, then the coins are bigger, i.e. not as many Bitcoins go in as if they are worth less. I would also watch out: If you store a lot of Bitcoins with less market value in it, and suddenly the value increases, then it can "block" the Bitcoins in it, edge them, bend them or maybe even blow up the safe! That's why I would always put a wet army wool blanket over it, so that nothing flies away or could catch fire in the surroundings...
;)