past perfect? or past simple?

Plese let me know if they are some mistakes for the verbs in bold

I was sitting in a quiet corner of the lobby of the Hotel Resplendent, that windy October afternoon, when a man with dark, curly hair and a slightly olive skin entered. I knew two things immediately: that I* had seen* this man before, and that* I did not know* where or in what context. He was impeccably dressed in a dark suit and pale green shirt, a tie with deep green and blue diagonal stripes, and a pair of black brogues. With the possible exception of the tie, all *had been *clearly custom-made. He walked across the lobby towards the lift and I lost sight of him.

Where did I see* him before? Before I had had a chance to consider this, the client whom I was awaiting also entered the lobby, and for the next couple of hours I was fully occupied. Later, around five, I retreated to my favourite coffee house, which was just round the corner, for a latte, a cheese and salad sandwich, and a good think. Why could I not place this man?*Had it been *a number of years since the first time I came across him? No, definitely not – this had been a recent meeting. So, in the period since I first* set *eyes on him, he * had changed his appearance. How?

had he been undergo plastic surgery? I didn’t believe it.* Did he wear *a beard or a moustache at the time of our first encounter? Again, that didn’t feel right. I would stake my reputation on having seen already, and not long since, the exact same face that I *saw *three hours ago in the lobby.

That left only one possibility: that he changed his ‘look’ compared to the first time I* saw* him. ‘Obvious’ you might say, but not to me. You must realise that I am used to dealing with individuals who adopt disguises, for any one of a number of reasons; in fact, I do it myself from time to time. If this was simply a different look, then it had to be a remarkable transformation that* had taken place – otherwise I would have figured out when and where that first encounter occurred.*

I ordered another latte and began to sketch from memory the face in the lobby. As I did so, I felt myself go deeper and deeper into concentration. And then it hit me. The last time I* had seen*the man with the bespoke tailoring* was* two months previously, at which time he was dressed as and was performing the functions of a public lavatory attendant!

As I realised this, I felt a familiar shiver - a mixture of excitement and apprehension. I was going to investigate this man, and that was going to take me, my gut feeling told me, into some dark and dangerous places. Because I noticed the man in the lobby for a second reason – three weeks previously, a man using the same Beirut tailorhad had tried to put a bullet through my head.

thanks to let me know even if it is a long text.