1. No tablets have left in the pack. The only grammatically correct combination here would be No tablets have left the pack. but this is perhaps too active for lifeless objects such as tablets, but some would use it.
2. No tablets left in the pack. this is a compacted (too compact except for very short informal replies) version of 3.,
«No tablets have left the pack» is very fun, but not correct even if to consider the tablets living forms: «No tablets have left the pack» = «They are all in there»...
No tablets are left in the pack. There are no tablets in the pack. There are no more tablets in the pack. There are no tablets left in the pack. There are no more tablets left in the pack. The pack contains no tablets. The pack contains no more tablets. The pack is empty. ____________