I have few A21263 , one each A13361 ,A21261.
The first digit after the A is the last digit of the year
The next three digits are the [that number] day of the year
The last digit is the shift
A21263
A 2 126 3
The 126th day of 2022, third shift
A13361
A 1 336 1
The 336th day of 2021, first shift
A21261
A 2 126 1
The 126th day of 2022, first shift
So you have one made in November 2021 and two made in May 2022
The filter from 2021 should still be the pink wire-backed media, while the 2022-production filters might not be.