It is a last duty for a soldier to attempt to destroy his weapon before surrendering but the Japanese certainly captured large supplies of weapons in the early days of the war. They did use some themselves but large scale use of captured weapons would cause an ammo supply problem they did not need. They tended to issue captured weapons to local forces they conscripted in their occupied areas, by the end of the war they had pretty well disposed of equipment they had captured earlier in the war.
Although my neighbors are all barbarians,
And you, you are a thousand miles away,
There are always two cups on my table.
- Tang Dynasty