Solderability testing on blank ENIG pcb's.

We have had an issue where a turnkey company has a solderability issue with boards that we supplied. The most thorough way of proving thay the boards work in my opinion is to take a bare panel randomly from the batch (same date code) to have it pasted and sent through the oven at the company that is responsible for assembling the boards. This we did and the bare boards soldered perfectly. Will this be proof enough or can other tests be done? Will appreciate anyones help.

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