Will CBP provide a traveler with any documentation or evidence showing status and time allowed in the U.S.?
Yes. At air and sea ports of entry, CBP will provide each traveler with an admission stamp that is annotated with date of admission, class of admission and admitted until date. The CBP admission stamp is listed as an alien registration document found in 8 CFR. 264.1. At land border ports of entry, each traveler will be provided with a paper Form I-94A.
podría demostrar mediante el sello que fue por tanto un error de sistema?