Final answer:
The buyers may be entitled to a return of their deposit if the sellers accepted the offer after the 72-hour condition.
Step-by-step explanation:
If the buyers made an offer on the exact terms of the listing contract with a condition to accept within 72 hours, they are entitled to a return of their deposit if the sellers accepted the offer after the 72-hour period. Based on the information provided, the broker was unable to contact the sellers until February 6, which is after the 72-hour deadline. Therefore, the sellers may be in breach of the agreement and the buyers have the right to demand the return of their deposit.