How to /testfor at least 10 items? [duplicate]

/testfor also does not have multi-target support. It just tells you there was a match, but not who that match was, and therefore you cannot target that player afterwards.

Even further, if there were multiple players with a "Room1" score of 2 and because you're only targeting the closest one of those, only that player will have their NBT data checked. The selector is processed before the NBT data, so if that player did not match, the command fails (even if the further player could've matched).

Checking NBT data requires you to specify exact values. For a range, you must use CommandStats to store the number of items the player has as a score, which is multi-target friendly. This also has the benefit of not requiring those items to be in the same stack.

Prerequisites

Objective to hold return value from CommandStats.

/scoreboard objectives add ItemCount dummy

Trigger to apply to players. The player will target their own "ItemCount" score when they run a command that returns an "AffectedItems" value (in this case, it'll be /clear). If new players can join at any time, you may need to run this on a clock.

/stats entity @a set AffectedItems @a[c=1] ItemCount

In order for CommandStats to modify its target's score, that target must be tracked on the scoreboard prior. This may also need to run on a clock.

/scoreboard players add @a ItemCount 0

Detection

Now when a player runs /clear, their "ItemCount" score will be set equal to the number of items cleared. If you set the maximum amount to 0, then the return value is the total number of those items in the player's inventory.

/execute @a ~ ~ ~ /clear @a[c=1] minecraft:dye 1 0 {display:{Name:"Body part"}}

And you can then target players based on their "ItemCount" score.

/say @a[score_Room1_min=2,score_Room1=2,score_ItemCount_min=10] has 10+ items.

Ill just get into to it:

First of all do this:

/scoreboard objective add BodyParts dummy

To give the item:

/give @p dye 1 1 {UnCounted:1b,{display:{Name:"Body part"}}

then have a command block doing this: (Repeating Command Block/Command Block on a clock)

/clear @p[score_Room1_min=2,score_Room1=2] dye 1 1 {UnCounted:1b}

then have a command block doing this: (Chain Commmand Block on Conditional/Comperator to another command block)

/scoreboard players add @p[score_Room1_min=2,score_Room1=2] BodyParts 1

then last command block on Chain Conditional again or Comperator to command block again:

/give @p[score_Room1_min=2,score_Room1=2] dye 1 1 {display:{Name:"Body part"}

Now that should add one to the BodyParts scoreboard and quickly replace the item held by the person.

Side Notes:

• This will only work if 1 person has the score Room1 of 2 if you want me to optimize it for multiplayer please comment.
• If in 1.9 all the repeat and chain command blocks must be always active