I have a hard time believing that the freezer would be better than a small fire safe for that purpose. The freezer has plastic seals that would melt, letting the heat in. All the frozen food/ice freezer would melt making for water damage.
...I mean, presumably you put it in a Ziploc bag first...
Takeaway food container. Bit of tape around the lip.
Yep, I agree, I didn't take the advice and I bought a fire safe instead.
Just FYI, they’re not really all that effective against fire outside of very narrow parameters. If you have one, consider placing it in places that tend to survive house fires, i.e., bottom corners or the structure, away from the kitchen and electrical or combustibles, preferably not below grade where the fire fighting water will flow.