I was going by the Intercepting Wireless Signals description on p. 225 of the original SR4 book (read that paragraph, and you know where I'm coming from).
The term 'intercept' is a bit misleading, and as it is, SR4A (just looking it up there) has renamed that into Capture Wireless Signal (p. 229).
The description in the original book is a bit more detailed, though.
On further reading, it looks like they split the original into the two actions (the Capture and the Intercept ones).
Jam Signals is not possible, because we have no jamming device, hence the idea to Edit the signal via the Matrix.
If that is not doable, we can only physically disable it (breaking the sending device with brute force).
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She recons their is probably a boosted RFID tag in the case somewhere.
Yeah, that much was clear from the beginning.

The question is, is there any way to block/scramble the signal
without a jammer (using Matrix actions, like Edit, on the signal)?
If not. Is it possible to pinpoint the location of the signal inside the case (have a better idea where in the case it is located)?
Either way, if blocking/scrambling the signal won't work, we have to open the package, take whatever is in there out and dump the part(s) that contains the tag(s), or just squish them.
That, of course, won't get those cruisers off Jake's rear...
Bye
Thanee