Jamieson, Fausset and Brown on Hebrews 8:7

7. Same reasoning as in He 7:11.

faultless--perfect in all its parts, so as not to be found fault with as wanting anything which ought to be there: answering all the purposes of a law. The law in its morality was blameless (Greek, "amomos"); but in saving us it was defective, and so not faultless (Greek, "amemptos").

should no place have been sought--as it has to be now; and as it is sought in the prophecy (He 8:8-11). The old covenant would have anticipated all man's wants, so as to give no occasion for seeking something more perfectly adequate. Compare on the phrase "place ... sought," He 12:17.