Oh I see.
So you are making the assumption that, the 'spare' chart they left on the Duty Auth's desk, (very possibly the one prepared the previous day by Lt K) somehow represented their pre-flight planning.
That's a pretty big assumption wouldn't you say???
Of course, as you well know, the reason they left a chart at all, (of course they had no requirement to) was a conscientous attempt to satisfy the duty auth who, as you also well know, through no fault of the crew, was not at his desk!
Doesn't quite seem to tie in with your 'laisser faire' allegation does it?
Would you care to debate in detail, a little more of that, factually sparse, allegation?