Packing Slip with Manufacturer Signature or Stamp?

Hello,

We have an open investigation for an FBA Shipment and we have been asked to provide proof of ownership. We are the manufacturer, so below is what we are being asked to provide. I see a lot of threads on this topic, but can someone clarify what is meant by the "Manufacturer signature or stamp"? This is not typically part of our process for our packing slips with our 3PL, so is a signature from an individual from our team as the manufacturer sufficient?

Request from Amazon:

If you are the manufacturer, send a copy of the signed packing slip. The packing slip must include the following information:

- Packing list date

- Shipment or purchase order ID

- Product names of the missing items

- Quantity shipped

- Manufacturer signature or stamp