Well, your dad inherited a little of it. The inherited value of those items on the date of death of his parents, would be your dad's basis in those items. He gifted them to you. When he gifted you items, his basis became your basis.
The rest of the items that he gifted to you will all be based on what he paid for them.
Most parents don't understand inheritance laws and your dad was being kind gifting them to you. Had he let you inherit them, you would have received fair market value at death. Instead, his basis is your basis. Without any kind of proof of basis, there isn't much you can do.
Reconstruct what you can so you are not paying taxes on the full amount.
On the bright side, these are long term investments and the capital gains tax rate is zero for single filers with taxable income below $40,000, MFJ below $80,000. So, if you finagle your finances, you may not have to pay tax on it at all.
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