Look out for scams. One such type of scam is where they say that your pet climbed into the back of their van and that they are now in Dublin or Cork or Manchester and if you send them the gas money or fare they will return your pet.
Do NOT offer a reward. Good people do not require a reward to return your pet and you leave yourselves open to scammers.
If it seems at all strange then it is strange and have nothing to do with it.