Final answer:
To find the number of boxes the office should buy, divide the total number of envelopes by the number of envelopes in each box. The office should buy 66 boxes of envelopes.
Step-by-step explanation:
To find the number of boxes the office should buy, we divide the total number of envelopes by the number of envelopes in each box:
2508 envelopes ÷ 38 envelopes/box = 66 boxes
Therefore, the office should buy 66 boxes of envelopes.