Thoughts on covering grading fees if card is not authentic?

I am selling some T206's that I purchased recently and received the following question from a potential bidder:
" Q: Is this card a reprint? Will you guarentee full refund incl shipping and costs of grading service? "
I am confident the cards are authentic, but am concerned of the off chance that a TPG could deem the card as non-authentic.
How have others dealt with this in the past? My normal refund policy is for full refund minus return shipping.
Should I guarantee authenticity by stating I will cover TPG fees if card is not authentic, or should I stick with just the full purhcase price, and any grading fees/shipping costs are on the buyer?
" Q: Is this card a reprint? Will you guarentee full refund incl shipping and costs of grading service? "
I am confident the cards are authentic, but am concerned of the off chance that a TPG could deem the card as non-authentic.
How have others dealt with this in the past? My normal refund policy is for full refund minus return shipping.
Should I guarantee authenticity by stating I will cover TPG fees if card is not authentic, or should I stick with just the full purhcase price, and any grading fees/shipping costs are on the buyer?
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Comments
Wayne Varner once told me "we'll never guarantee a grade, but we will guarantee it WILL grade".
That seems fair enough.
I'd insist it has to be graded with PSA or SGC within a reasonable (30 day) period of time.
Always looking for Topps Salesman Samples, pre '51 unopened packs, E90-2, E91a, N690 Kalamazoo Bats, and T204 Square Frame Ramly's
The only financially prudent way for a seller to "guarantee" that a card
will grade is to sell the card already graded.
Sellers are required to "guarantee" that a card is authentic UNLESS the
listing states it is a reprint.
I have no clue how a seller can "guarantee" what a subjective review
of a card will determine.
I would never pay failed-grading fees for anybody other than myself.
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Working on:
Football
1973 Topps PSA 8+ (99.81%)
1976 Topps PSA 9+ (36.36%)
1977 Topps PSA 9+ (100%)
Baseball
1938 Goudey (56.25%)
1951 Topps Redbacks PSA 8 (100%)
1952 Bowman PSA 7+ (63.10%)
1953 Topps PSA 5+ (91.24%)
1973 Topps PSA 8+ (70.76%)
1985 Fleer PSA 10 (54.85%)