There are No real unsearched rolls anywhere anymore these days. In the past yes you can get them and also in the past you can search through unsearch rolls and will also varieties. These days you can get the old paper and the re roll coin and put a coin in one end and also the tail with some special dates or coins to get buyers to take chance to bid or buy them. It is almost like a lotto, but set up with something like some seller are selling a 1909-S in BU and another coin in the other end. So when bidding be very careful in what you are buying.
Unfortunately there is really no strategy for finding valuable old coins from circulation. Some unsearched rolls may exist out there somewhere, but if they exist they are in the possession of someone who has no clue they could be worth anything. If someone is selling an "unsearched" roll on Ebay, you can be quite sure it has been searched since that person is seeking to make a profit, so obviously they have first searched the roll to make sure there is no coin of value in it that would yield them a greater profit than selling the roll. If you are trying to find valuable old coins from circulation, there is no shortcut to the tedious process of searching unsearched rolls that you get from the bank, 99.99% of which contain no coins above face value. It's all just luck. Someone who knows nothing about coins unwittingly reintroduces a valuable coin into circulation and you are the lucky one who finds it first.
You're making a blanket statement that is absolutely false. This isn't to say the great, great majority of those offered, especially on eBay or the like, are anything but shams, but true original rolls do, in fact, still exist. The bigger problem is understanding that they're not likely to simply fall into one's lap.
For you naysayers about unsearched rolls .... I used to roll pennies back in my youth in the early 70s. Collect change, put them in boxes, sort and separate them and then put them in rolls, some I put in flips but probably only about 100. The quarters I used to take to the bank and deposit but for some reason I kept the pennies. I still have them, and I haven't looked at them since the 70s. I just noticed some of the paper rolls are disintegrating too. So I took a few pics for you guys/gals and them put them back away. @bdunnse would like the jar below.