I think you need to remove the wheel first then they can be unclipped fairly easily.. This at least means they are protected from theft by the locking wheel nuts. Just as well at the price they are. You do sometimes see used ones offered on ebay a bit cheaper.
It may sound ridiculous repairing plastic hub caps but if they get scuffed it may be cheaper to get them repaired with flexible bumper filler and resprayed rather than buying a new one. They are silver not white.
Or as others have done, run them without caps until just before the car is sold. They are unique. I dont know of any after market alternative caps that will fit.
Even more ridiculous, I have currently got after market alloy wheels s fitted to my EX which only cost me about £60 each brand new.(calculated by deducting the cost of the tyres alone from what I paid for a ready fitted tyre/wheel package . I got a bargain. They would probably now cost at least £100 -£120 each) My original Honda wheels ,tyres and windmill caps are in my garage, safe and sound. They are not for sale
)
Dont let the hubcaps issue put you off the mk4 . Most owners love the car. And you would be equally livid and out of pocket if you kerb damage the diamond cut alloys fitted to many cars these days
