I agree with Al that the items listed are not 'customer property' in the ISO sense. They may be covered, though, in different sections of 13485, depending on the specific contents of the documents:
- Supplier Agreement and Certificates - 4.2.3,4.2.4, 4.2.5, 7.2.1
- Supplier Self Assessment Reports - 8.2.1, 4.2.5
- Artwork and Labels demanded by Customers - 4.2.3,4.2.4, 4.2.5, 7.5.1e
Note, for example, that if the customer instead provided the physical labels, then that would be customer property.
If they instead provided, say, a silkscreen stencil for your company to use to make labels, that would be customer-supplied tooling.