The mistery of the lost rucksack

Why things are never straightforward in life? At least in my life they're not.

"The husband" lost his rucksack with his very expensive laptop in it and then later on that day he got a phone call from someone who found it. I don't know the exact conversation but according to "the husband" the gist of it was that she (it was a lady) founded the rucksack and the computer so he asked her address to collect it. Then things get complicated. The lady said that she didn't know the name of the street where she lives and gave only a number and general directions such as "opposite the train station in Sabadell"; she said that she'd be at home later that night and also said that she could be contacted on the number where she was calling.

The poor and gullible "husband" was sooo relief and happy that he didn't stop to consider that it was weird that somebody doesn't know her own address, he even bought a box of chocolates for the woman. The he asked me to take him to all the train stations in Sabadell trying to find the number. On and on we went, luckily there's only 5 stations in Sabadell, but he couldn't find the number. Anywhere.
Then he tried calling the woman again but the phone number is unavailable.

Only then it down on him that something was wrong.

Now we think that the number is from a public payphone and that the address given id totally fake.

The mystery now is: if they didn't ever have any intention of returning the computer, why did they call on the first place? Did they want a reward? Why didn't ask for it?

In a current climate of the chance of terrorist attack in public places (remember that last year there was a bomb in a train in Madrid) I don't think that normal honest people would ever pick up an abandoned rucksuck. But then, if they're not intent on returning it, why calling?

I told the husband to go to the police, but then... should he reported a theft? After all if somebody found it they're not technically thieves, altough it can be argued that they are once they known who the owner is and choose not to return it.

So, we not only have a mistery but some moral conundrums here too.