RFID tag to erase or zap

Good morning, once more i ask for some little help.

An item has to be sent to a potential customer,that could became a potential competitor. Inside a part ,an RFID tag is buried,and i would like that nobody else could read the data in the tag.

I tried unsuccessfully to destroy it in 2 ways:

1)An hobbystic Royer oscillator,tuned on the frequency of the tag(125 KHz) 2)An EMP pulse,about 500A, from a big capacitor discharged through a coil in free air

Is not possible to unmount the part and put it in the microwave oven.

The Royer oscillator is very basic,center tapped 10 turns coil,a battery of polypropylene capacitors,2 MOSFETs,12V power supply. It is not very efficient,consumption is 2 A not loaded,it could rise close to 4A depending from load size and material and distance from the coil. It can turn sligthly red a small screwdriver.It was tuned adding-removing some capacitors and stretching-compressing the coil. Of course the load affects the frequency.

The EMP zapper is even more basic:a 4400 uF-400V capacitor,charged until

120V through 20 ohms,and discharged through 0.1 ohm..by hand, no MOSFETs or other kind of solid state switches. I tried 2 kinds of coil,11 turns solenoid in free air (on an empty plastic tin reel)and spiral coil : this is the current as measured on the 0.1 ohm,50V/division->500A /division

This operation has to be done only for this case,by now,so i 'm looking for a cheap solution. Anyway if an appropriate programmer could erase the tag i will look for it. I doubt that the tag could be so easily erasable without knowing some kind of password.Is it correct?

Thanks for any hint,and for your attention and patience

Diego