It's a lab that handles Russian samples. I think it would be strange is the senior person there did not have some kind of dialogue with people at WADA, anything odd, suspicious is noted and discussed. WADA would have paid more attention to what's going on at this lab than any other lab in the world I imagine.
A positive test is less than 1% chance, and in figure skating this would be much lower since it is so rare. They can't deny someone the opportunity they earned at the Olympics because unprocessed sample that 99.9% of the time would be fine.
The lab had already blamed COVID for the delays when RUSADA was asking for the results, so this information would have been relayed to Kamila and her team. No reason to suspect anything other than the lab being disorganised.
As we now know of course, that was all BS the COVID excuse the lab and WADA used.
It would have been good to have those 7th, 8th and 9th tests retested, but they were destroyed. Retesting would simply confirm that the tests were indeed inconclusive rather than showing a positive or negative (which would have changed everything about the selection of the Olympic team of course). Not that I doubt the lab, but there is always human error.