There is this thing in WIFs called "checksum" that you could have used to reduce this ridiculously big number to only one or two possible keys for 3 missing characters. Then importing them into a wallet to check becomes much easier.
And even if it's a much longer list of private keys, you can use something like
bitcoin-tool to convert them into addresses and
comm to check which ones have a balance. This way you can check millions of addresses in seconds.