Looking For A Few Silver Circulated Roosevelt Dimes

My nine year old grandson began to take an interest in some of my coins so we decided to see if he could put together a set of dimes from circulation. I get him a couple of rolls each week and he's pretty much competed the '65 through 2019 issues.
I decided to surprise him and give him the silver issues so he'd have one of everything.
I went through sellers junk boxes at shows and was able to find most, but I'm still missing 6 coins to finish.
I'm not looking for MS coins, just circulated dimes I can give him to finish his set. If he decides to go on with it, he can upgrade all of them himself when he gets older.
I'm looking for:
'46-S
'50-D
'55
'58
'61
'64
I'd like to finish this off for him and since the junk boxes are hit or miss, I thought maybe I'd have better luck here.
Thanks for any help you can give me.