KMC Forums - Black and white thriller about a little boy in a removal truck

Can anyone help identify a great little black and white movie I caught early one Sunday morning a few years ago? I'd love to try and buy a copy if I can find it.

Here's what I know -

It's black and white

It has a 50s feel, but could be late 40s to late 60s

I think it's Canadian

It's about a little boy (about 5yo) who goes missing when his parents move house. He is playing on the day of the move and hides in the back of the removal van but they close it up and drive away, but I think he overhears them talking about burglary while he's stuck in the back of the van. He's quite a smart little cookie and dodges them even after they discover he's there. He eventually runs to a farmhouse where the old couple realise it's the little boy that's been on the radio news all day, so it ends well.

It's a great atmospheric movie! Quite tense and menacing and kinda bleak and I'd love to know if anyone remembers it and has a name for it.