The seal isn't for airtightness (the plastic containers aren't airtight), it's a security seal that all the manufacturers put in from an abundance of caution after the Tylenol scandal of the '70s.

If it's inside the expiration date and there wasn't anything about the package that looked tampered with, I wouldn't worry about it.

(But if I had extra eggs, I would've used one of them to make the mayo rather than buy a whole container...)