He has already stated that he has not ever knowingly replaced the tabs.
My question is does it look like a relatively new tab that has lost its gold plating and therefore in his words, tarnished, or does it look like a really worn original tab that has lost it’s size/shape/lustre, given comparison to Martyn’s very nice example. I cannot believe Breitling, or for that matter any watch company, will replace this without even informing the owner, and for what gain? Did they charge for a new tabs, they couldn’t have, given the OP has said the tabs have not been replaced, so what for, so that they can take the tiny bits of gold and melt it down for scrap, then for owner not to even notice they change the tab (which begs the question why was it even replaced in the first place). Does that sound plausible? To me it’s more likely to be very simply, the original old tab has worn down from a number of service and polishes over the last 26 years.
From his perspective. Firstly there might be a chance he got confused, he saw the tabs are worn after the October service, in the past after a good breitling service and polish they come back looking quite good and shiny. This time the tab looks extra small and maybe they were overzealous on the polish, the lustre has now gone, the watch looks a bit knackered despite the polish. He calls up breitlong, they don’t know his watch off by heart but the service centre knows the replacement parts are indeed now plated ( because perhaps it’s not economical anymore to keep 18k parts for this watch), he puts 2 and 2 together, and draws the conclusion that the lost in lustre on his watch and so called tarnishing is because at some point in the past they had replaced the tabs with plated ones (unlikely for reasons above and picture), he accuses them of swapping out his tabs some time in the past. Confusions all round, he writes complaining emails through the company, breitling USA CEO now gets involved, they get in to debate on call, OP wants a free replacement tabs in 18k gold because he feel he has been wronged, CEO says that is really cheeky, Breitling then tell him to leave them alone now and to stop bothering them, sends letter from legal department. He is still frustrated and confused, he further digs out ownership and management of Breitling, they ignore him now. He now trashes Breitling finally across forums to show them and as a final act to either make him feel better, or in hope Breitling retracts their decision to not replace the tabs.
This is how sharp it should look when unpolished, his one looks classic over polish of melted chocolate