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Contrarily some agents don't check anything. I had a 600k deposit for my most recent house purchase (I'll check myself into the golf club thread in a minute ⛳, majority of it was equity from previous houses) and I wrote all this down in the offer - noone checked, absolutely noone. I could have been telling multiple lies about the money where it was from etc and it wouldn't have come out in the wash for some time.
Bottom line is get everything, absolutely everything, checked out thoroughly because people can and do lie quite a lot.
That's my thought with the larger deposit - less likely to suddenly realise they don't like the look of the mortgage payments.