The assessment of the pk'ing admin is correct, the rule for no pk lockping during the event dictates that you may enter the property for the sole intent and purpose of achieving your goal. Claiming ignorance because "it's not explicitly written" is just bad faith.
That being said, if you return the items taken we will reverse your PK and make it extra super duper clear next time that no, entering the property to get your event points =/= carte blanche to steal things (over 10k in value!)
Make a support ticket and organize with staff to track down what items you took, where they are and how to return them and then you can be unpked.