How do i determine Bianchi Infinito year of manufacture from these labels WBK446115F and TPJ611528F?

Phone the bianchi distributor and ask them. The UK one is very helpful.

web search Bianchi Distributor (country x)

I'll add that it's normally quite easy to tell the model year by the livery. With Bianchi you can also tell the original specification by the livery. Compare yours to the back catalogue.