The tax law is clear that you must have receipts to be allowed to take the deduction.
It is your responsibility to prove the amount of your donations. And as @LindaA stated above you must have proof of the cash donations. If you give cash, check or charge payments on one day to one organization of $250 or more, you must have a receipt in your hands before filing your tax return. If not, you are not entitled to the deduction.
See Records to Keep in IRS Pub 526, Charitable Contributions.
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