Thanks for that report Ricky. It is more common for crankshaft seals to blow out than in, but both are possible if the seal fits fairly loosely. There are pressure pulsations in the crankcase due to the piston moving up and down in the cylinder, which causes the volume of the crankcase to change very rapidly. The PCV valve opens when the pressure is positive, to allow blow-by (gas leakage past the piston rings) to escape, then closes when the pressure is negative, so that there will be no escape of blow-by overall: most of the time, there is a slight vacuum in the crankcase. So, a stuck PCV valve will result in a high positive pressure in the crankcase, and this will blow out either a seal or a gasket. A properly-functioning PCV valve will maintain a slight crankcase vacuum, encouraging a loose-fitting seal to be sucked inward. In Honda engines there is some space between the upper crankshaft bearing (a ballrace) and the top oil seal, because that space is used to separate oil from gas, before the gas passes into the PCV chamber on top of the engine. The oil seal should be a tight fit in the crankcase, so it has to be driven into position, not pushed in under finger-power. For you to have been able to remove the seal (from the outside, without drilling through it to allow you to use a hook), after it had dropped down into the cavity below its normal position, sounds very much as if it fits very loosely and should be replaced.
The fact that the seal moved down, not up, indicates that your engine has a low rate of blow-by resulting in negative crankcase pressure, as it should be.
