Brian Rogers, a small-scale beekeeper in Great Falls MT also goes to the box stores for mouse guards. He used the metal dry wall corner strips - cut with scissors, perforated for ventilation, easy to secure, AND cheap!
This is what I use, might be the same stuff...
https://www.homedepot.com/p/27-in-x-8-ft-Steel-Lath-2-5-METAL-LATH/202093395
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