The way to check whether the door seal is OK: Put a bank note between the door seal and the fridge cabinet. The bank note should be gripped by the seal and could not fall out. Do this in 4 or 5 places around the door seal. If the bank note falls out in any location ,it means the seal or door needs to be replaced or adjusted.
All chest freezers have fully adjustable hinges.
Or take a 0.08 mm thick pieces of paper on the door gasket at any position, shut the door, paper not free fall, suggests that the ordinary sealed performance is good.