In Resume^x, Perfect progressive^x

Dear Mr Micawber, Mister Micawber wrote:I presume it is the same stative verbs that do not normally appear in any progressive form: see, prefer, hate, contain, cost, etc. The verbs that you have stated above can be used in the present perfect but not in the present perfect progressive, right?...

You've selected a verb ('to work') for which the difference between the present perfect and the present perfect continuous is practically insignificant. There are other verbs for which one of these is possible, and the other, anomalous. For these, it may be easier to understand the difference...