In most situations, the basis of an asset is its cost to you. The cost is the amount you pay for it in cash, debt obligations, and other property or services.
Cost includes sales tax and other expenses connected with the purchase. Your basis in some assets isn't determined by the cost to you.
If you acquire property other than through a purchase (such as a gift or an inheritance), refer to Publication 551, Basis of Assets for more information.
Topic No. 703 Basis of Assets
This link may assist you in determining the original value.
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