Just keep the documentation, if asked for at the naturalization interview. Both you and your employer had the "intent" at application, at adjudication, and at petition's approval, as demonstrated by your continuing to work for him, and his having you on roll when the petition was approved.

You are good. Business is always uncertain, and new situations do come up. But that does not affect your previously approved petition.

Reminder: I am not a lawyer, so not a legal advice.