No don't leave silica packets (or other desiccant) out in the open, it will absorb all the water it can from the ambient air and will be unable to dry the sclerotia properly. If it is too late for your silica, some of them are rechargable by putting the packs in the oven at a reasonable temperature to dry it out.
Leaving the sclerotia just on a sheet of paper (avoid paper towels because you do not want them sticking to the sclerotia or mushrooms) is fine as a first stage. It's best to let some air wash over it, a fan can do that - it only has to be at a quite minimal setting, for nothing more than recycling of air and the humidity of it and thus the capacity to dry.
Once they are pretty dry, you can leave the sclerotia in an air-tight container that also has the silica or other desiccant in it. In the closed space the silica will dry out the air and the dry air will pull out the last of the water from the sclerotia.
All of this is identical with mushrooms and other things as well (though not something like cannabis, you don't want that too dry!). A difference with mushrooms is that you can eat and chew dry mushrooms but dry sclerotia are hard as shit. You have to rehydrate sclerotia like raisins before you eat them. Just let them sit in some water though not too much otherwise it will be an extraction / tea and you will need to drink the water to avoid losing alkaloids.