IF it has Shimano components, there will be a 2 letter date code.

IF the broken spokes are NDS rear, the wheel was likely built with inadequate tension.
This causes the elbows to flex too much and fatigue.
The remaining spokes will probably proceed like popcorn. Popping faster & faster.
Either respoke the wheel or replace.
One advantage you have is you can easily remove & measure a spoke to find what length you need.