Should i message this ebay seller that he has not sent the item i bought yet?

i bought on the 15th april a 20 pack of sugar free sweets/mints on ebay, however its the 16th today and the seller has still not sent my item out? it says on ebay the expected delivery date in the 19th of april. should i be worried that he has not sent the item yet? could it be a dubious seller? do i message him/them? show more i bought on the 15th april a 20 pack of sugar free sweets/mints on ebay, however its the 16th today and the seller has still not sent my item out? it says on ebay the expected delivery date in the 19th of april.

should i be worried that he has not sent the item yet? could it be a dubious seller? do i message him/them?
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