No, because that one person, having placed thousands of connectors, is most likely better at the job than you or anyone you know. Also, these are connectors - it'd be obvious in testing if they didn't work.
If your suppliers are like this, there is no telling what they will do to cut costs. A cursory test right out of production is not panacea.
Also, I'm writting code for a crucial part of the project, so it would be obvious if it don't work. So no silly unit test or anything.