If they submitted e-signatures on a F.8879 and you e-filed, all is good, right.  But if you meant they didn't sign the F.8879 or the e-signatures do not conform to the requirements, you'd want to correct that ASAP. 

Failure in doing so could be deemed a breach of the ERO regulations and likely Circular 230.  It may also render the return invalid, just like filing a return without signature in wet ink in the good 'ol days.