Thanks for the help everybody. I now know
Luftwaffe navigational training and practice apparatus
Case translation: Behalter = container, Lehr = teaching, Ubungsgerat= practice
Value $600.00, similar item without map & papers recently sold for (450.00 €) $500.00
L.K.S. stands for "Luftkreigsschule" and in this instance, LKS 4 (4th Air War School). It was based at Fürstenfeldbruck Field from 1935-1945 and was a major Luftwaffe Wehrmacht training facility for the duration of WWII.
Paper inside case: Empfangsbescheinigung= receipt, Hilfsgerat = auxiliary device
This is a class room training set, List of contents, Instructor and student names
Two student names on document are, Alas Schulz and Karl Schulz, both of which are very common names in Germany.
Fürstenfeldbruck Air Base was located 500 kilometer South-Southwest of Berlin, north of the town of Fürstenfeldbruck in Bavaria, near Munich.
The Air Base was established in 1935, and from 1937 onward, the 4th Air War School/Air Base was operated by the Nazi regime for the rearmament of the Wehrmacht Air Force. It was the largest aviation school in the Third Reich. Field Marshal Herman Goering is said to have taken a deep personal interest in establishing the air force training base for the German Air Force and modeled Fürstenfeldbruck after the United States Army Air Force training center at Randolph Field, Texas.
The 4th Air War School used the following aircraft: Ar 66, Ar 96, Bf 108, Bü 131, Bü 181, C.445, Fw 44, Fw 56, Fw 58, Grunau Baby, He 46, He 51, Kl 25, Kl 35, Kranich, W.33 and W.34
The RAF and USAAF understood that Fürstenfeldbruck was used extensively as a training base and believed it to be of little strategic importance. Consequently, it escaped bombing until the later stages of the war.
A new concrete runway was completed in 1943 and in 1944, Luftwaffe leaders rushed work to extend the Air Base's runways long enough for fighter/bomber aircraft. In early 1945, pilot training ended at the school and the students were assigned to the 10th and 11th FallschirmJäger (paratroopers) Divisions.
As the war neared its final critical stages, the Luftwaffe was able to mount fighters and Me-262 jet fighter/bomber aircraft from the base. That, however, provoked the Allies to make a bombing raid on the field.
On 9 April 1945, 338 B-17s of the 1st Air Division, 8th Air Force, unleashed 867 tons of bombs on the runways, hangars, repair shops, and other facilities destroying the base.