No, unless I miss my guess it is not intended as humor - though maybe a little tongue in cheek. It is in fact, quite accurate, and not only for the UK. For the several agencies involved with every call of this type it is a pain in the ass, for many of them it can be very difficult to deal with. Until the final disposition by the EOD techs at the very end of the incident, nobody knows for certain what the material is or the hazard that it represents, so it has to be treated as if it is live. As Bonnex explained, resolution can typically take all day, or in the case of my home area, several days (EOD team with responsibility for this area has a 14 hour response time, if they leave right away). Throughout the process nearly the last person anyone listens to is the owner, if they are involved at all. The owner typically has a vested interest in the process - value of the item, avoiding prosecution, etc., and many had no idea what they had in the first place.
Once the EOD team arrives they want to do the job and go home. The liklihood that the piece is returned to the owner is very low - most teams have seen occasions where they have responded twice or three different times for the same piece - once it happens the first time you make sure it cannot happen again. Nobody in this entire process wants to give out a piece of paper to the owner. There is always some idiot that, after causing this entire issue through negligence/ignorance/carelessness etc wants to go to court to get their toys back.
I say this as both a collector and someone that has worked in and around the response side for pretty much all of my life. These incidents occur much more often than most people realize and cause a drain on local resources at least as much as Bonnex explains. The moral of the story is that it is up to you as the collector to make the effort to get your pieces home intact, and live with the loss if it doesn't make it home. I've got a collector driving 700 miles to pick up some pieces from me next weekend, then catching some sleep and driving 700 miles back. He knows he will get his items, and has high certainty he will get them home. If it is important to you then find someone to help.