You are probably making this more complicated than it needs to be.
This section of the Standard relates to incoming raw materials and ensuring that they are correct according to order and specification and will not cause contamination.
Raw materials for can ends are essentially the metal, lacquer, wax, inks,sealing compound and packaging materials..
The grade and specifications should have previously been designed and agreed between your development department and supplier, so at intake what you are looking for is that it is the correct material and to the correct specification.
Inks particularly are unlikely to show any problems until you try to use them on the line without carrying out extensive unrealistic analytical work
With most of these materials, there is very little that you can practically do at intake to ensure that they meet the specification and you are reliant upon your supplier assurance programme.
At intake you are limited to checking the labels, batch coding (including shelf life if appropriate) and the physical condition - damage, infestation etc.
You may have agreed with your supplier that a Certificate of Analysis or Compliance is provided with each delivery. Often there are difficulties in pairing up these with specific deliveries as they are often sent as e mail attachments to commercial departments and are therefore not readily available to your warehouse staff.
The simplest thing to do is construct a matrix for each material and supplier which details what checks you consider necessary. This can then be used by the warehouse staff at the point of receipt.
Be practical about it. The more complicated you make it the higher the chance of your warehouse staff missing something.