need help finding a stocks share price on a specific day

i was gifted some stock shares

im trying to figure out what my starting value as accurate as possible so i know what my gain/loss is when im ready to sell it

the stock trading account cant tell me the starting value

it seems like such a simple basic question but since ift was a gifted transfer, it wasnt recorded as a sale, so it doesnt have a starting cost value.

they said they will send a note to another dept who will get back to me but that was a week ago

so can anyone tell me what is the best way to find the accurate value price per share of psec on jan 3rd 2022 when the account was created?

i rather not just look at a chart and guess at it (i did this already) but its enough stock that a few pennies difference matters a lot by the time you add it all up

also would my starting value be based on the market open price or the closing price for the stock since it gained like 0.08 in value on that day