Does this look real?

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This jersey was acquired from Steiner Sports. It came with a Steiner COA but not a hologram on the jersey (you can see where it had been attached). When I contact Steiner, they said they do not replace holograms and occasionally one will fall off. I sold it last week with the Steiner COA to help my son with some unexpected expenses. The buyer claims it is not real. I own over 20 Dallas Cowboys jerseys and it really looks good to me -- am I missing something? It shows moderate use with customized sleeves. It may have been laundered but stains are still present especially on the numbers. The Cowboys wore blue jerseys in 2 games in 2009 and this is from a game against the Bucs. The other game was against the Redskins.